The correct sequence is to start with a business goal, translate that into a technical strategy and have architectural initiatives follow from that.

A write-up how Dropbox rearchitected and broke up their monolith into pragmatic components. Nice to read that their base was a large Python code base, a bit similar to Instagram which is still running a branch of Django underneath.

https://hynek.me/articles/semver-will-not-save-you/